Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a1ea7421d6587c…

MALICIOUS

PDF

92.6 KB Created: 2020-12-19 13:53:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 56963f928964ae136a45db54214136c5 SHA-1: 0f3903ab82a3bf23a9645e1f4513676a40c0da05 SHA-256: 15a1ea7421d6587c04cb0e0c1e413ef4a365a7e0dc523aa00eb42ba274289821
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafffe.ru/strik?utm_term=lyrics+to+we+didn%2527t+start+the+fire+meaning PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366351/normal_5fc253180b2d6.pdfIn PDF document text
    • https://tanaxigurav.weebly.com/uploads/1/3/4/2/134266775/4c2cb17da89382.pdfIn PDF document text
    • https://vazujupipizake.weebly.com/uploads/1/3/4/7/134719511/bevexizelogeno-nuzuto-wifusora.pdfIn PDF document text
    • https://volinamonapefez.weebly.com/uploads/1/3/4/4/134494747/xerisuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502246/normal_5fd3d32ce43cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427274/normal_5f9e4c8378ba4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383322/normal_5fccea6c2f212.pdfIn PDF document text
    • https://dodimugu.weebly.com/uploads/1/3/4/4/134483739/d6fef3ff.pdfIn PDF document text
    • https://jabipiduluw.weebly.com/uploads/1/3/4/6/134662585/9740051.pdfIn PDF document text
    • https://zegojipoxe.weebly.com/uploads/1/3/1/0/131069766/0f68603896.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420747/normal_5f98f1ac49ce6.pdfIn PDF document text
    • https://gunobodupisar.weebly.com/uploads/1/3/4/6/134677737/josamidis-navigarusaka-bedowapumeje-rokivenuditazas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/beholder_2_pl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22dd2d1f-2f50-4fc3-873a-6cf91c59113f/21474155123.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12948 5572 bytes
SHA-256: a1d385d97ffd6c2575c69a2713add7b90ecb1f266fa214a63cddecb05c4eba58
font_01_sfnt_off00013c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C38 12988 bytes
SHA-256: 3f469fce5cd8081031377f0ba66c316cd4bcc3868204dd9e1d21f7f4256c8428